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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ccf14096bbb78a5bac80ace562111ba97fab30685efea6d066ffd17f3a7bee' 
  AND token = 'vR17K91Gn5ya+GUxrnxXnNNcifd/bJpkBkA2Q6mSUKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}